Code:
C:\Program Files (x86)\Wiimm\WIT>wit ID6 "G:\emu\Media\Nintendo GameCube\Roms\Animal Crossing (USA).gcz"
!! wit: ERROR #30 [WRONG FILE TYPE] in SourceIteratorHelper() @ src/lib-sf.c#603
!! GameCube or Wii ISO image expected: /cygdrive/g/emu/Media/Nintendo
!! GameCube/Roms/Animal Crossing (USA).gczWIT doesn't seem to like with Dolphin gcz files. I googled it and others have same issue.